The Aprilaire Scale Control Insert 4236 is the U-shaped component which encases the Water Panel Evaporator. Used with number 35 water panel and 4277 water distribution tray for models 560, 560A, 568, 700 (almond color), 760, 760A and Models 768. Also see the part number 4837 maintenance kit for the models 560, 560A and 568. Or maintenance kit 4750 for the 700 series.